**This is an interactive problem!**

Okabe Rintarou, the mad scientist is doing research to find the most desired Steins Gate. Besides being a mad scientist, he is a student too. As a result, he has to attend online classes. Class `$i$`

occurs between `$B_{i}$`

th hour and `$E_{i}$`

th hour (`$B_i \leq E_i$`

). That is to say, Class `$i$`

begins at `$B_i$`

th hour and ends at `$E_i$`

th hour. [**N.B:** `$B_i$`

th hour and `$E_i$`

th hour are considered as class hours too.]

This is a companion discussion topic for the original entry at https://toph.co/p/hououin-kyouma